Cromwell o



(No Model.)

0. 0. CASE. METHOD OF MAKING PULLEYS.

Patented Feb. 18; 1890.

Wiimesses UNITED STATES PATENT OFFICE.

P. & F. CORBIN,

OF SAME PLACE.

METHOD OF MAKING PULLEYS.

QIEEGIFIGATION forming part of Letters Patent No. 421,668,12latedFebruary 18, 1890.

Application filed September 20, 1889- Serial No. 324,479- (No model.)

To all whom it may concern.-

Be it known that I, CROMWELL 0. CASE, a citizen of the United States,residing at New Britain, in the county of Hartford and State ofConnecticut, have invented certain new and useful Improvements in theMethod of Making Pulleys, of which the following is a specification.

My invention relates to improvements in the method of making pulleys orwheels; and the object of my invention is to produce the article at asmall cost and of superior quality.

In the accompanying drawings, Figure 1 is a side elevation of my pulley.Fig. 2 is a section thereof on line a w of Fig. 1. Fig. 3 is a side viewof the blank for the body portion. Fig. 4 is an end view of the headedpiece for the hub portion. Fig. 5 is an edge view of the blank for thebody portion. Fig. 6 is a side view of the piece shown in Fig. 4, andFigs. 7 and 8 are sectional views of the complete pulley or Wheel withdifferent forms of periphery.

The pulley or wheel herein shown and described is made the subject of aseparate application of even date herewith.

I first form the blank for the body portion A by cutting a disk from afiat sheet of metal of uniform thickness, as shown in Figs. 3 and 5,punching the central hole a, Fig. 3, which holeI prefer to make of anangular form, and, if desired, I also punch other holes from the bodyportion for ornament, to reduce the weight of the pulley, or for otherpurposes. The hub portion 12,1 form of wire by first making a headedpiece with a square neck 0 immediately under the head, as shown in Figs.4 and 6, the neck 0 being of a form and size to fit the central hole inthe body-blank. The angular neck 0 is not essential, and the smallerportion under the head may be made round, if desired, and the centralhole in the bodyblank may be made of a corresponding form or enlarged ornotched at one side. Iprefer, however, to make a square orirregular-shaped hole, and make the neck of acorresponding form in orderto insure the body portion and hub being so secured that they will notrotate one with reference to the other. part of the headed piece, Figs.4 and 5, is placed in the central hole of the body blank or disk whenthe small end of the hub portion is upset or headed, throwing it intothe form shown in Figs. 1, 2, 7, and 8, excepting that when first formedit has no axial hole. If the hole in the disk is of an irregular formand the neck of the tenon round, the upsetting of the metal will shapethe neck to correspond with the form of the hole. The body or disk isplaced in a lathe or some special machine either before or after the huband disk are united and the outer edge of the body portion is spread outand wrought into the desired form for the peripheral flanges d d,preferably by spinning. The final form of the peduce pulleys or wheelsof any desired form. The concave form shown in Figs. 1 and2 may beproduced by a single operation in the spinning-lathe, and after themetal-is thus spread out it may be subjected to another operation tomake a flat groove for 'a chain, as shown in Fig. 8, or a wheel with aconvex periphery.

I claim as my invention- 1. The improvement in the manufacture ofpulleys or wheels, which consists, in part, in forming a fiatsheet-metal disk for the body portion of the pulley, spreading out andreducing its edge into the desired form of periphery, substantially asdescribed, and for the purpose specified.

2. The improvement in the manufacture of pulleys or wheels, whichconsists in forming the hub or central portion in a headed piece and thebody portion in the form of a disk of sheet metal, with a central holeheading the small end of the hub portion to fasten said the edge of thebody portion into the desired form of periphery, substantially asdescribed, and for the purpose specified.

CROMWELL 0. CASE. Witnesses:

ALBERT N. ABBE, G. E. Roor.

The smaller ripheral flanges may be varied, so as to proparts together,spreading out and reducing- Fig. 7, or a plain-faced wheel or pulley, asin

